The Wyoming Highway Patrol says crews across the state are working to re-open roads.
You can see from the map below that much of I-80 is currently closed due to hazardous conditions and multiple crashes.
Four semis were stuck on South Pass overnight, according to WYDOT District 5.
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As of 1 p.m. on Thursday, March 14, much of Interstate 80 in Wyoming was closed in one or both directions, according to the Wyoming Department of Transportation.